I use libdrm from git, too, and that builds/installs fine. This error is preventing me from building mesa git on my Debian sid amd64 system with RadeonHD 4550. I've tried doing a git clean, and even cloning a fresh copy, but it still gives the same error. It's been happening for weeks, and I'm finally breaking down and asking for help:

make[3]: *** No rule to make target `../../../../src/gallium/auxiliary/libgallium.a', needed by `r600_dri.so'. Stop.

Here is the configure process (I made a few minor edits to avoid legal controversy ;P ):
Code:
# ./autogen.sh --prefix=/usr/local --with-gallium-drivers=r600,swrast --disable-egl --enable-vdpau --with-dri-drivers=radeon
autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal -I m4
autoreconf: configure.ac: tracing
autoreconf: running: libtoolize --copy
autoreconf: running: /usr/bin/autoconf
autoreconf: configure.ac: not using Autoheader
autoreconf: running: automake --add-missing --copy --no-force
autoreconf: Leaving directory `.'
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking for style of include used by make... GNU
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking dependency style of gcc... gcc3
checking for ar... ar
checking the archiver (ar) interface... ar
checking how to print strings... printf
checking for a sed that does not truncate output... /bin/sed
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for fgrep... /bin/grep -F
checking for ld used by gcc... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B
checking the name lister (/usr/bin/nm -B) interface... BSD nm
checking whether ln -s works... yes
checking the maximum length of command line arguments... 1572864
checking whether the shell understands some XSI constructs... yes
checking whether the shell understands "+="... yes
checking how to convert x86_64-unknown-linux-gnu file names to x86_64-unknown-linux-gnu format... func_convert_file_noop
checking how to convert x86_64-unknown-linux-gnu file names to toolchain format... func_convert_file_noop
checking for /usr/bin/ld option to reload object files... -r
checking for objdump... objdump
checking how to recognize dependent libraries... pass_all
checking for dlltool... no
checking how to associate runtime and link libraries... printf %s\n
checking for archiver @FILE support... @
checking for strip... strip
checking for ranlib... ranlib
checking command to parse /usr/bin/nm -B output from gcc object... ok
checking for sysroot... no
checking for mt... mt
checking if mt is a manifest tool... no
checking how to run the C preprocessor... gcc -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for dlfcn.h... yes
checking for objdir... .libs
checking if gcc supports -fno-rtti -fno-exceptions... no
checking for gcc option to produce PIC... -fPIC -DPIC
checking if gcc PIC flag -fPIC -DPIC works... yes
checking if gcc static flag -static works... yes
checking if gcc supports -c -o file.o... yes
checking if gcc supports -c -o file.o... (cached) yes
checking whether the gcc linker (/usr/bin/ld -m elf_x86_64) supports shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no
checking how to run the C preprocessor... gcc -E
checking for gcc... (cached) gcc
checking whether we are using the GNU C compiler... (cached) yes
checking whether gcc accepts -g... (cached) yes
checking for gcc option to accept ISO C89... (cached) none needed
checking dependency style of gcc... (cached) gcc3
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking dependency style of g++... gcc3
checking how to run the C++ preprocessor... g++ -E
checking for ld used by g++... /usr/bin/ld -m elf_x86_64
checking if the linker (/usr/bin/ld -m elf_x86_64) is GNU ld... yes
checking whether the g++ linker (/usr/bin/ld -m elf_x86_64) supports shared libraries... yes
checking for g++ option to produce PIC... -fPIC -DPIC
checking if g++ PIC flag -fPIC -DPIC works... yes
checking if g++ static flag -static works... yes
checking if g++ supports -c -o file.o... yes
checking if g++ supports -c -o file.o... (cached) yes
checking whether the g++ linker (/usr/bin/ld -m elf_x86_64) supports shared libraries... yes
checking dynamic linker characteristics... (cached) GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether gcc and cc understand -c and -o together... yes
checking dependency style of gcc... gcc3
checking for gmake... no
checking for make... make
checking for python2... no
checking for python... python
checking for a sed that does not truncate output... (cached) /bin/sed
checking for makedepend... /usr/bin/makedepend
checking for bison... bison -y
checking for bison... /usr/bin/bison
checking for flex... flex
checking lex output file root... lex.yy
checking lex library... -lfl
checking whether yytext is a pointer... yes
checking for perl... /usr/bin/perl
checking for indent... cat
checking if compiling with clang... no
checking whether gcc version is sufficient... yes
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking whether gcc supports -Werror=missing-prototypes... yes
checking whether gcc supports -fvisibility=hidden... yes
checking whether g++ supports -fvisibility=hidden... yes
checking whether to enable assembly... yes, x86_64
checking for gcc option to produce PIC... -fPIC
checking for dlopen... no
checking for dlopen in -ldl... yes
checking for posix_memalign... yes
checking for the pthreads library -lpthreads... no
checking whether pthreads work without any flags... no
checking whether pthreads work with -Kthread... no
checking whether pthreads work with -kthread... no
checking for the pthreads library -llthread... no
checking whether pthreads work with -pthread... yes
checking for joinable pthread attribute... PTHREAD_CREATE_JOINABLE
checking if more special flags are required for pthreads... no
checking for PTHREAD_PRIO_INHERIT... no
checking for LIBDRM... yes
checking for X11... yes
checking for GLPROTO... yes
checking for DRI2PROTO... yes
checking for XF86VIDMODE... yes
checking for DRIGL... yes
checking expat.h usability... yes
checking expat.h presence... yes
checking for expat.h... yes
checking for XML_ParserCreate in -lexpat... yes
checking for RADEON... yes
checking for VDPAU... yes
checking for llvm-config... /usr/bin/llvm-config
checking for RADEON... yes
configure: creating ./config.status
config.status: creating configs/current
config.status: creating Makefile
config.status: creating src/Makefile
config.status: creating src/egl/Makefile
config.status: creating src/egl/drivers/Makefile
config.status: creating src/egl/drivers/dri2/Makefile
config.status: creating src/egl/drivers/glx/Makefile
config.status: creating src/egl/main/Makefile
config.status: creating src/egl/main/egl.pc
config.status: creating src/egl/wayland/Makefile
config.status: creating src/egl/wayland/wayland-drm/Makefile
config.status: creating src/egl/wayland/wayland-egl/Makefile
config.status: creating src/egl/wayland/wayland-egl/wayland-egl.pc
config.status: creating src/gallium/Makefile
config.status: creating src/gallium/auxiliary/pipe-loader/Makefile
config.status: creating src/gallium/drivers/Makefile
config.status: creating src/gallium/drivers/r300/Makefile
config.status: creating src/gallium/drivers/r600/Makefile
config.status: creating src/gallium/state_trackers/clover/Makefile
config.status: creating src/gallium/targets/opencl/Makefile
config.status: creating src/gbm/Makefile
config.status: creating src/gbm/main/gbm.pc
config.status: creating src/glsl/Makefile
config.status: creating src/glsl/glcpp/Makefile
config.status: creating src/glsl/tests/Makefile
config.status: creating src/glx/Makefile
config.status: creating src/glx/tests/Makefile
config.status: creating src/gtest/Makefile
config.status: creating src/mapi/es1api/Makefile
config.status: creating src/mapi/es1api/glesv1_cm.pc
config.status: creating src/mapi/es2api/Makefile
config.status: creating src/mapi/es2api/glesv2.pc
config.status: creating src/mapi/glapi/Makefile
config.status: creating src/mapi/glapi/gen/Makefile
config.status: creating src/mapi/glapi/tests/Makefile
config.status: creating src/mapi/shared-glapi/Makefile
config.status: creating src/mapi/shared-glapi/tests/Makefile
config.status: creating src/mapi/vgapi/Makefile
config.status: creating src/mapi/vgapi/vg.pc
config.status: creating src/mesa/Makefile
config.status: creating src/mesa/gl.pc
config.status: creating src/mesa/drivers/Makefile
config.status: creating src/mesa/drivers/dri/dri.pc
config.status: creating src/mesa/drivers/dri/common/Makefile
config.status: creating src/mesa/drivers/dri/i915/Makefile
config.status: creating src/mesa/drivers/dri/i965/Makefile
config.status: creating src/mesa/drivers/dri/Makefile
config.status: creating src/mesa/drivers/dri/nouveau/Makefile
config.status: creating src/mesa/drivers/dri/r200/Makefile
config.status: creating src/mesa/drivers/dri/radeon/Makefile
config.status: creating src/mesa/drivers/dri/swrast/Makefile
config.status: creating src/mesa/drivers/osmesa/Makefile
config.status: creating src/mesa/drivers/osmesa/osmesa.pc
config.status: creating src/mesa/drivers/x11/Makefile
config.status: creating src/mesa/libdricore/Makefile
config.status: creating src/mesa/main/tests/Makefile
config.status: creating src/mesa/x86-64/Makefile
config.status: creating src/mesa/x86/Makefile
config.status: executing depfiles commands
config.status: executing libtool commands

        prefix:          /usr/local
        exec_prefix:     ${prefix}
        libdir:          ${exec_prefix}/lib
        includedir:      ${prefix}/include

        OpenGL:          yes (ES1: no ES2: no)
        OpenVG:          no

        OSMesa:          no
        DRI drivers:     radeon
        DRI driver dir:  ${libdir}/dri
        GLX:             DRI-based

        EGL:             no

        llvm:            yes
        llvm-config:     /usr/bin/llvm-config
        llvm-version:    3.1

        Gallium:         yes
        Gallium dirs:    auxiliary drivers state_trackers
        Target dirs:     dri-r600 dri-swrast vdpau-r600 vdpau-softpipe 
        Winsys dirs:     radeon/drm sw sw/dri sw/xlib 
        Driver dirs:     galahad identity llvmpipe noop r600 rbug softpipe trace 
        Trackers dirs:   dri vdpau 

        Shared libs:     yes
        Static libs:     no
        Shared-glapi:    yes

        CFLAGS:          -g -O2 -Wall -std=c99 -Werror=implicit-function-declaration -Werror=missing-prototypes -fno-strict-aliasing -fno-builtin-memcmp -fPIC
        CXXFLAGS:        -g -O2 -Wall -fno-strict-aliasing -fno-builtin-memcmp -fPIC
        Macros:          -D_GNU_SOURCE -DUSE_X86_64_ASM -DHAVE_DLOPEN -DHAVE_POSIX_MEMALIGN -DIN_DRI_DRIVER -DUSE_XCB -DGLX_INDIRECT_RENDERING -DGLX_DIRECT_RENDERING -DUSE_EXTERNAL_DXTN_LIB=1 -DIN_DRI_DRIVER -DHAVE_ALIAS -DHAVE_LLVM=0x0301

        PYTHON2:         python

        Run 'make' to build Mesa